DIFFERENCE OF SELF-ENERGY CORRECTIONS FOR CHARGED AND UNCHARGED STATES IN DEGENERATE 2-DIMENSIONAL SYSTEMS

We study the Landau level fan diagram for charged and uncharged states in n-type modulation doped quantum wells with photoluminescence (PL) and photoluminescence excitation (PLE) measurements. In magnetic field s, the adjacent peak distance is different for PL and PLE. The peak en ergy for PL oscillates periodically in inverse magnetic fields while t he peak energy for PLE does not oscillate. Time resolved PL shows that the difference of adjacent peak distance in PL and PLE is due to the hole relaxation and breaking of the transition selection rule. Within the experimental resolution, we attribute the different oscillatory be havior of the PL and PLE peak energies to different self-energy correc tions for charged and uncharged states. (C) 1998 Elsevier Science B.V. All rights reserved.